a small amount of their heat to the atmosphere
when the currents form. The temperature of the current can vary from 100°C up
to 800°C. Depending on the density PDCs can be categorized into two groups. If
the column contains a lot of solid
material while it collapses it is called
pyroclastic flows, however, if the quantity of solid
material is low compared
to the gases it is called a pyroclastic
/volcanoes/volcanic-hazards/pyroclastic-flow/